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values of the input fields in the form posted. The collection is populated when the Content-Type header is either application/x-www-form-urlencoded or multipart/form-data.

Headers

Gets a name-value collection filled with all the header values in the request.

InputStream

Gets a Stream object representing the contents of the incoming HTTP content body.

Params

Gets a name-value collection that is a union of four other similar collections: QueryString, Form, ServerVariables, and Cookies.

QueryString

Gets a name-value collection containing all the query string variables sent by the client.

ServerVariables

Gets a name-value collection filled with a collection of Web server–defined variables.

UserHostAddress

Gets the Internet Protocol (IP) address of the remote client.

UserHostName

Gets the Domain Name System (DNS) name of the remote client.

UserLanguages

Gets an array of strings denoting the list of the languages accepted by the client for the specified request. The languages are read from the Accept-Language header.

The Params collection combines four different but homogeneous collections—QueryString, Form, ServerVariables, and Cookies—and it replicates the information contained in each of them. The collections are added in the following order: QueryString, Form, Cookies, and finally ServerVariables.

Information About the Connection

Table 16-14 lists the properties that relate to the open connection.

Table 16-14. Properties Describing the Connection

Property

Description

ApplicationPath

Gets the virtual path of the current application.

IsAuthenticated

Indicates whether or not the user has been authenticated.

IsLocal

Indicates if it is a local request.

IsSecureConnection

Indicates whether the connection is taking place over a Secure Sockets Layer (SSL) using HTTPS.

LogonUserIdentity

Gets an object representing the Windows identity of the current user as logged at the IIS gate.

Path

Gets the virtual path of the current request.

PathInfo

Gets additional path information for the requested resource, if any. The property returns any text that follows the URL.

PhysicalApplicationPath

Gets the file system path of the current application’s root directory.

PhysicalPath

Gets the physical file system path corresponding to the requested URL.

RawUrl

Gets the raw URL of the current request.

Url

Gets the Uri object that represents the URL of the current request.

UrlReferrer

Gets the Uri object that represents the URL from which the current request originated.

The Uri class provides an object representation of a Uniform Resource Identifier (URI)—a unique name for a resource available on the Internet. The Uri class provides easy access to the parts of the URI as well as properties and methods for checking host, loopback, ports, and DNS.

The server variables set in the ServerVariables collection are decided by the run-time environment that processes the request. The information packed in the collection is, for the most part, excerpted from the HTTP worker request object; another part contains Web server–specific information. The ServerVariables collection is just a friendly name/value model to expose that information.

Methods of the HttpRequest Class

Table 16-15 lists all methods exposed by the HttpRequest class.

Table 16-15. HttpRequest Methods

Method

Description

BinaryRead

Performs a binary read from the current input stream. The method lets you specify the number of bytes to read and returns an array of bytes. The method is provided for compatibility with ASP. ASP.NET applications should read from the stream associated with the InputStream property.

MapImageCoordinates

Maps an incoming image-field form parameter to x/y coordinate values.

MapPath

Maps the specified virtual path to a physical path on the Web server.

SaveAs

Saves the current request to a file disk with or without headers. This method is especially useful for debugging.

ValidateInput

Performs a quick, nonexhaustive check to find potentially dangerous